How does regex pattern work?

A regex pattern matches a target string . The pattern is composed of a sequence of atoms. An atom is a single point within the regex pattern which it tries to match to the target string. The simplest atom is a literal, but grouping parts of the pattern to match an atom will require using ( ) as metacharacters.

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Is replace case-sensitive JavaScript?

replace(‘JavaScript’, ‘Java’); //”Java is JavaScript!” If you specify a value (instead of a regular expression), only the first occurrence of the value will be replaced. To replace all occurrences (case-sensitive) of a specified value, we can use a regular expression with global modifier ( g flag) .

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